I am trying to get an activboard connected I have not worked with the promethean board before, I upgraded the software to the current version. Before I updated the software the activboard was working flawless. It shows as an active connection, but will not write. you can however write on the promethean board and all functions. when I try to calibrate the activboard at the end it shows the USB hub with a red X. I have replaced the usb with a known working one and still nothing. any sugestions?